The y component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation
Ey = (375 N/C) cos[kx - (2.20 × 1014 rad/s)t]. What is the wavelength of this electromagnetic wave? (c = 3.0 x 108 m/s)
A) 0.272 µm B) 17.1 µm C) 2.72 µm D) 1.36 µm E) 8.57 µm
E
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A person's eye lens is 2.7 cm away from the retina. What must the focal length of this lens be in order for an object placed at the near point (N = 25.0 cm) of the eye to focus on the retina?
A) -3.4 cm B) -2.4 cm C) 2.4 cm D) 3.4 cm E) 2.6 cm
The two main theories of 20th century physics are
A) relativity and quantum theory. B) relativity and Newtonian mechanics. C) quantum theory and electromagnetism. D) relativity and electromagnetism. E) electromagnetism and thermodynamics.
Which of these is considered true about the mass of the neutrino?
a. It is the same as the mass of an electron or positron. b. It is the same as the mass of a nucleon. c. It is the same as the mass of an alpha particle. d. It is zero. e. It is slightly more than zero, but less than an electron.
A telescope's resolving power measures its ability to see
A. fainter sources. B. finer details in sources. C. larger sources. D. more distant sources.